Yesterday, Jaguar introduced its newest all-aluminum hi-po sedan, the XJR Portfolio — fittingly, at the British Motor Show in London. The Portfolio is the production version of the Concept Eight the company showed off in New York in 2004. It'll be available this fall in regular and long-wheelbase versions, both powered by a supercharged 4.2-liter producing a barely-respectable (these days) 400 hp. Still, with a stated zero-to-60 time of 5.0 seconds, the concentration on weight savings makes a more potent mill less necessary than in some steel-heavy luxobarges. That's exactly that kind of apologist's line that proves how much we want Jaguar to survive, if just for the club-room interiors and that aura of olde British respectability. We'll see, mates.